Recent questions tagged disks - GATE CSE Doubts

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Self Doubt Disks
when solving questions of disks 10KB is 1024*10B or 1000*10B? different sources are telling different things,even same sources are telling different things at different time.

asked 2 days ago in Operating System by Nitinkumar.097 (13 points) | 13 views

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Ace Test Series
Question- Consider a disk with 8 sectors per track and 512 bytes per sector. The disk rotates at 3000rpm and an avg seak time of 15ms. A file has 8 blocks. The max time to access the entire file using index allocation is ____ms Answer is 247.5 but I did not find any explanation..Can i get

asked Dec 22, 2020 in Operating System by vipin.gautam1906 (5 points) | 8 views

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JP HAYES Problem number 6.17

asked Aug 16, 2020 in CO & Architecture by StoneHeart (735 points) | 26 views

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Self doubt - GATE2007-IT-44
Question source : https://gateoverflow.in/3479/gate2007-it-44-isro2015-34 This question has a discussion that average seek time : $\frac{N}{3}$ Source PAGE 9 : http://pages.cs.wisc.edu/~remzi/OSFEP/file-disks.pdf Another source : https://en. ... provide some easy explanation with your words that how it ends up $\frac{N}{3}$ as I am getting difficulty to visualize.

asked Aug 9, 2020 in Operating System by KUSHAGRA गुप्ता (1.4k points) | 11 views

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Which disk scheduling algorithm provides minimum seek time?

asked Apr 22, 2020 in Operating System by Dheeraj Sohan P (5 points) | 20 views

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GATE2005-70 Video Solution
Consider a disk drive with the following specifications: $16$ surfaces, $512$ tracks/surface, $512$ sectors/track, $1$ KB/sector, rotation speed $3000$ rpm. The disk is operated in cycle stealing mode whereby whenever one $4$ byte word is ready it is sent ... $40$ nsec. The maximum percentage of time that the CPU gets blocked during DMA operation is: $10$ $25$ $40$ $50$

asked Apr 18, 2020 in CO & Architecture by admin (569 points) | 6 views

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GATE2013-29 Video Solution
Consider a hard disk with $16$ recording surfaces $(0-15)$ having 16384 cylinders $(0-16383)$ and each cylinder contains $64$ sectors $(0-63)$. Data storage capacity in each sector is $512$ bytes. Data are organized cylinder-wise and the addressing format ... number of the last sector of the file, if it is stored in a contiguous manner? $1281$ $1282$ $1283$ $1284$

asked Apr 18, 2020 in Operating System by admin (569 points) | 5 views

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GATE2007-IT-44, ISRO2015-34 Video Solution
A hard disk system has the following parameters : Number of tracks $= 500$ Number of sectors/track $= 100$ Number of bytes /sector $= 500$ Time taken by the head to move from one track to adjacent track $= 1 \ ms$ Rotation speed $= 600 \ rpm$. What is ... taken for transferring $250$ bytes from the disk ? $300.5 \ ms$ $255.5 \ ms$ $255 \ ms$ $300 \ ms$

asked Apr 18, 2020 in Operating System by admin (569 points) | 8 views

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GATE2004-49 Video Solution
A unix-style I-nodes has $10$ direct pointers and one single, one double and one triple indirect pointers. Disk block size is $1$ Kbyte, disk block address is $32$ bits, and $48$-bit integers are used. What is the maximum possible file size? $2^{24}$ bytes $2^{32}$ bytes $2^{34}$ bytes $2^{48}$ bytes

asked Apr 18, 2020 in Operating System by admin (569 points) | 5 views

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GATE2015-1-48 Video Solution
Consider a disk pack with a seek time of $4$ milliseconds and rotational speed of $10000$ rotations per minute (RPM). It has $600$ sectors per track and each sector can store $512$ bytes of data. Consider a file stored in the ... sector is half of the time for one complete rotation. The total time (in milliseconds) needed to read the entire file is__________________

asked Apr 18, 2020 in Operating System by admin (569 points) | 15 views

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GATE2012-41 Video Solution
A file system with $300$ GByte disk uses a file descriptor with $8$ direct block addresses, $1$ indirect block address and $1$ doubly indirect block address. The size of each disk block is $128$ Bytes and the size of each disk block address is $8$ Bytes. ... file size in this file system is $3$ KBytes $35$ KBytes $280$ KBytes dependent on the size of the disk

asked Apr 18, 2020 in Operating System by admin (569 points) | 5 views

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GATE2007-11, ISRO2009-36, ISRO2016-21 Video Solution

asked Apr 18, 2020 in Operating System by admin (569 points) | 6 views

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GATE2009-51 Video Solution
A hard disk has $63$ sectors per track, $10$ platters each with $2$ recording surfaces and $1000$ cylinders. The address of a sector is given as a triple $\langle c, h, s \rangle$, where $c$ is the cylinder number, $h$ is the surface number ... $\langle 400, 16, 29 \rangle$ corresponds to sector number: $505035$ $505036$ $505037$ $505038$

asked Apr 18, 2020 in Operating System by admin (569 points) | 5 views

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GATE2014-2-20 Video Solution
A FAT (file allocation table) based file system is being used and the total overhead of each entry in the FAT is $4$ bytes in size. Given a $100 \times 10^6$ bytes disk on which the file system is stored and data block size is $10^3$ bytes, the maximum size of a file that can be stored on this disk in units of $10^6$ bytes is _________.

asked Apr 18, 2020 in Operating System by admin (569 points) | 7 views

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GATE1993-6.7 Video Solution
A certain moving arm disk storage, with one head, has the following specifications: Number of tracks/recording surface $= 200$ Disk rotation speed $= 2400$ rpm Track storage capacity $= 62,500$ bits The average latency of this device is $P$ ms and the data transfer rate is $Q$ bits/sec. Write the values of $P$ and $Q$.

asked Apr 18, 2020 in Operating System by admin (569 points) | 7 views

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GATE2015-2-49 Video Solution
Consider a typical disk that rotates at $15000$ rotations per minute (RPM) and has a transfer rate of $50 \times 10^6$ bytes/sec. If the average seek time of the disk is twice the average rotational delay and the controller's transfer time is $10$ times the disk transfer time, the average time (in milliseconds) to read or write a $512$-byte sector of the disk is _____

asked Apr 18, 2020 in Operating System by admin (569 points) | 7 views

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GATE2018-53 Video Solution
Consider a storage disk with $4$ platters (numbered as $0, 1, 2$ and $3$), $200$ cylinders (numbered as $0, 1, , 199$), and $256$ sectors per track (numbered as $0, 1, 255$). The following $6$ disk ... negligible. The total power consumption in milliwatts to satisfy all of the above disk requests using the Shortest Seek Time First disk scheduling algorithm is _____

asked Apr 18, 2020 in Operating System by admin (569 points) | 6 views

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GATE2003-25, ISRO2009-12 Video Solution
Using a larger block size in a fixed block size file system leads to better disk throughput but poorer disk space utilization better disk throughput and better disk space utilization poorer disk throughput but better disk space utilization poorer disk throughput and poorer disk space utilization

asked Apr 18, 2020 in Operating System by admin (569 points) | 9 views

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GATE1995-14 Video Solution
If the overhead for formatting a disk is $96$ bytes for a $4000$ byte sector, Compute the unformatted capacity of the disk for the following parameters: Number of surfaces: $8$ Outer diameter of the disk: $12$ cm Inner diameter of ... rpm, determine the effective data transfer rate which is defined as the number of bytes transferred per second between disk and memory.

asked Apr 18, 2020 in Operating System by admin (569 points) | 9 views

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GATE1993-7.8 Video Solution
The root directory of a disk should be placed at a fixed address in main memory at a fixed location on the disk anywhere on the disk at a fixed location on the system disk anywhere on the system disk

asked Apr 18, 2020 in Operating System by admin (569 points) | 8 views

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GATE2005-IT-81-b Video Solution
A disk has $8$ equidistant tracks. The diameters of the innermost and outermost tracks are $1$ cm and $8$ cm respectively. The innermost track has a storage capacity of $10$ MB. If the disk has $20$ sectors per track and is currently at the end of the $5^{th}$ sector ... starting from the sector $4$ of the outer-most track? $13.5 \ ms$ $10 \ ms$ $9.5 \ ms$ $20 \ ms$

asked Apr 18, 2020 in Operating System by admin (569 points) | 5 views

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GATE2011-44 Video Solution
An application loads $100$ libraries at startup. Loading each library requires exactly one disk access. The seek time of the disk to a random location is given as $10$ ms. Rotational speed of disk is $6000$ rpm. If all $100$ libraries are loaded from random locations on the disk, how ... start of the block may be neglected.) $0.50 \ s$ $1.50 \ s$ $1.25 \ s$ $1.00 \ s$

asked Apr 18, 2020 in Operating System by admin (569 points) | 12 views

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GATE1999-2-18, ISRO2008-46 Video Solution
Raid configurations of the disks are used to provide Fault-tolerance High speed High data density (A) & (B)

asked Apr 18, 2020 in Operating System by admin (569 points) | 5 views

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GATE2008-32 Video Solution
For a magnetic disk with concentric circular tracks, the seek latency is not linearly proportional to the seek distance due to non-uniform distribution of requests arm starting and stopping inertia higher capacity of tracks on the periphery of the platter use of unfair arm scheduling policies

asked Apr 18, 2020 in Operating System by admin (569 points) | 14 views

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GATE2005-IT-81-a Video Solution
A disk has $8$ equidistant tracks. The diameters of the innermost and outermost tracks are $1$ cm and $8$ cm respectively. The innermost track has a storage capacity of $10$ MB. What is the total amount of data that can be stored on the disk if it is used with a drive that rotates ... $80 \ \text{MB}$; II. $360 \ \text{MB}$ I. $360 \ \text{MB}$; II. $80 \ \text{MB}$

asked Apr 18, 2020 in Operating System by admin (569 points) | 8 views

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GATE2001-8 Video Solution
Consider a disk with the following specifications: 20 surfaces, 1000 tracks/surface, 16 sectors/track, data density 1 KB/sector, rotation speed 3000 rpm. The operating system initiates the transfer between the disk and the memory sector-wise. Once the head has ... What is the maximum percentage of time the CPU is held up for this disk I/O for cycle-stealing DMA transfer?

asked Apr 18, 2020 in Operating System by admin (569 points) | 15 views

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GATE2001-1.22 Video Solution
Which of the following requires a device driver? Register Cache Main memory Disk

asked Apr 18, 2020 in Operating System by admin (569 points) | 8 views

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GATE1996-23 Video Solution
A file system with a one-level directory structure is implemented on a disk with disk block size of $4K$ ... What is the maximum possible number of files? What is the maximum possible file size in blocks

asked Apr 18, 2020 in Operating System by admin (569 points) | 22 views

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GATE2001-20 Video Solution
Consider a disk with the $100$ tracks numbered from $0$ to $99$ rotating at $3000$ rpm. The number of sectors per track is $100$ and the time to move the head between two successive tracks is $0.2$ millisecond. Consider a set of disk ... at track $0$ and the elevator algorithm is used to schedule disk requests, what is the worse case time to complete all the requests?

asked Apr 18, 2020 in Operating System by admin (569 points) | 19 views

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GATE2009-52 Video Solution
A hard disk has $63$ sectors per track, $10$ platters each with $2$ recording surfaces and $1000$ cylinders. The address of a sector is given as a triple $\langle c, h, s \rangle$, where $c$ is the cylinder number, $h$ is the surface number and $s$ is the sector ... $\langle 0, 16, 30 \rangle$ $\langle 0, 16, 31 \rangle$ $\langle 0, 17, 31 \rangle$

asked Apr 18, 2020 in Operating System by admin (569 points) | 8 views

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GATE1998-2-9 Video Solution
Formatting for a floppy disk refers to arranging the data on the disk in contiguous fashion writing the directory erasing the system data writing identification information on all tracks and sectors

asked Apr 18, 2020 in Operating System by admin (569 points) | 8 views

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GATE2005-21 Video Solution
What is the swap space in the disk used for? Saving temporary html pages Saving process data Storing the super-block Storing device drivers

asked Apr 18, 2020 in Operating System by admin (569 points) | 8 views

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GATE1997-74 Video Solution
A program $P$ reads and processes $1000$ consecutive records from a sequential file $F$ stored on device $D$ without using any file system facilities. Given the following Size of each record $= 3200$ bytes Access time of $D = 10$ ... using a blocking factor of $2$ (i.e., each block on D contains two records of $F$) and $P$ uses one buffer?

asked Apr 18, 2020 in Operating System by admin (569 points) | 14 views

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GATE2005-IT-63 Video Solution
In a computer system, four files of size $11050$ bytes, $4990$ bytes, $5170$ bytes and $12640$ bytes need to be stored. For storing these files on disk, we can use either $100$ byte disk blocks or $200$ byte disk blocks (but can't mix block ... blocks respectively? $35400$ and $35800$ bytes $35800$ and $35400$ bytes $35600$ and $35400$ bytes $35400$ and $35600$ bytes

asked Apr 18, 2020 in Operating System by admin (569 points) | 9 views

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GATE1990-7-c Video Solution
A certain moving arm disk-storage device has the following specifications: Number of tracks per surface=$404$ Track storage capacity=$130030$ bytes. Disk speed=$3600$ rpm Average seek time=$30$ m secs. Estimate the average latency, the disk storage capacity and the data transfer rate.

asked Apr 18, 2020 in Operating System by admin (569 points) | 15 views

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GATE1999-1.9 Video Solution
Listed below are some operating system abstractions (in the left column) and the hardware components (in the right column) ... 4 (A) - 3 (B) - 2 (C) - 4 (D) - 1 (A) - 4 (B) - 1 (C) - 2 (D) - 3

asked Apr 18, 2020 in Operating System by admin (569 points) | 6 views

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GATE1998-25-a Video Solution
Free disk space can be used to keep track of using a free list or a bit map. Disk addresses require $d$ bits. For a disk with $B$ blocks, $F$ of which are free, state the condition under which the free list uses less space than the bit map.

asked Apr 18, 2020 in Operating System by admin (569 points) | 6 views

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GATE1998-17 Video Solution
Calculate the total time required to read 35 sectors on a 2-sided floppy disk. Assume that each track has 8 sectors and the track-to-track step time is 8 milliseconds. The first sector to be read is sector 3 on track 10. Assume that the diskette is soft sectored and the controller has a 1-sector buffer. The diskette spins at 300 RPM and initially, the head is on track 10.

asked Apr 18, 2020 in Operating System by admin (569 points) | 11 views

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GATE1998-25b Video Solution
Consider a disk with $c$ cylinders, $t$ tracks per cylinder, $s$ sectors per track and a sector length $s_l$. A logical file $d_l$ with fixed record length $r_l$ is stored continuously on this disk starting at location $(c_L, t_L, s_L)$, where ... the formula to calculate the disk address (i.e. cylinder, track and sector) of a logical record n assuming that $r_l=s_l$.

asked Apr 18, 2020 in Operating System by admin (569 points) | 13 views

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Disk Scheduling
1.SSTF-0 27 53 98.Tracks are labelled from 0-99.Head starts at 28. How will head move when it hits 0?Will it go to 53 or to 98(with seek time 1) 2.Clook-14,37,65,67,98,122,124,183.T racks are labelled from 0-199.Head starts at 53 and moves left. Do we need to add the seek time when head moves from 14 to 183? Hi

asked Dec 20, 2019 in Operating System by Aravind Adithya (5 points) | 20 views

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